/*
 * Copyright (C) 2013 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.example.jbmsuppliers.bluetooth.le;

import android.annotation.SuppressLint;
import android.app.Service;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothGatt;
import android.bluetooth.BluetoothGattCallback;
import android.bluetooth.BluetoothGattCharacteristic;
import android.bluetooth.BluetoothGattDescriptor;
import android.bluetooth.BluetoothGattService;
import android.bluetooth.BluetoothManager;
import android.bluetooth.BluetoothProfile;
import android.content.Context;
import android.content.Intent;
import android.os.Binder;
import android.os.IBinder;
import android.util.Log;

import java.util.List;
import java.util.UUID;

import static android.content.ContentValues.TAG;

import com.jbm.jbmsupplier.util.*;

/**
 * Service for managing connection and data communication with a GATT server hosted on a
 * given Bluetooth LE device.
 */
@SuppressLint("NewApi")
public class JBMBLEEGuard extends Service {
    private final static String TAG = JBMBLEEGuard.class.getSimpleName();

    private BluetoothManager mBluetoothManager;
    private BluetoothAdapter mBluetoothAdapter;
    private String mBluetoothDeviceAddress;
    private BluetoothGatt mBluetoothGatt;
    private int mConnectionState = STATE_DISCONNECTED;

    private static final int STATE_DISCONNECTED = 0;
    private static final int STATE_CONNECTING = 1;
    private static final int STATE_CONNECTED = 2;

    public final static String ACTION_GATT_CONNECTED           = "com.example.bluetooth.le.ACTION_GATT_CONNECTED";
    public final static String ACTION_GATT_DISCONNECTED        = "com.example.bluetooth.le.ACTION_GATT_DISCONNECTED";
    public final static String ACTION_GATT_SERVICES_DISCOVERED = "com.example.bluetooth.le.ACTION_GATT_SERVICES_DISCOVERED";
    public final static String ACTION_DATA_AVAILABLE           = "com.example.bluetooth.le.ACTION_DATA_AVAILABLE";
    public final static String EXTRA_DATA                      = "com.example.bluetooth.le.EXTRA_DATA";

    public final static UUID UUID_HEART_RATE_MEASUREMENT       = UUID.fromString(SampleGattAttributes.HEART_RATE_MEASUREMENT);
    private IEGuardKey ekey;

    // Implements callback methods for GATT events that the app cares about.  For example,
    // connection change and services discovered.
    private BTKeyGattCallback mGattCallback1;
    private final BluetoothGattCallback mGattCallback = new BluetoothGattCallback()
    {
        private BluetoothGattCharacteristic notifycha = null;
        private BluetoothGattCharacteristic writecha = null;

        @Override
        public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState)
        {
            String intentAction;
            if (newState == BluetoothProfile.STATE_CONNECTED) {
                intentAction = ACTION_GATT_CONNECTED;
                mConnectionState = STATE_CONNECTED;
                Log.i(TAG, "Connected to GATT server.");
                // Attempts to discover services after successful connection.
                Log.i(TAG, "Attempting to start service discovery:" +
                        mBluetoothGatt.discoverServices());

            } else if (newState == BluetoothProfile.STATE_DISCONNECTED) {
                intentAction = ACTION_GATT_DISCONNECTED;
                mConnectionState = STATE_DISCONNECTED;
                Log.i(TAG, "Disconnected from GATT server.");
            }
        }

        @Override
        public void onServicesDiscovered(BluetoothGatt gatt, int status)
        {
            if (status == BluetoothGatt.GATT_SUCCESS) {
                List<BluetoothGattService> BTDev = getSupportedGattServices();
                if (BTDev != null)
                    for (BluetoothGattService gattsrv : BTDev)
                    {
                        List<BluetoothGattCharacteristic> gattchas = gattsrv.getCharacteristics();

                        for (BluetoothGattCharacteristic gattcha : gattchas)
                        {
                            int prop = gattcha.getProperties();
                            if ((prop & BluetoothGattCharacteristic.PROPERTY_NOTIFY) > 0)
                                notifycha = gattcha;
                            if ((prop & ( BluetoothGattCharacteristic.PROPERTY_WRITE_NO_RESPONSE |
                                    BluetoothGattCharacteristic.PROPERTY_WRITE)) > 0)
                                writecha = gattcha;
                        }
                    }
                if ( notifycha != null )
                {
                    setCharacteristicNotification(notifycha, false);
                    setCharacteristicNotification(notifycha, true);
                }

                if ( writecha != null )
                {
                    writecha.setValue(0,
                            BluetoothGattCharacteristic.FORMAT_UINT8, 0);
                    writecha.setValue("@04000000001603*");
                    writeCharacteristic(writecha);
                }
            } else {
                Log.w(TAG, "onServicesDiscovered received: " + status);
            }
        }

        @Override
        public void onCharacteristicRead(BluetoothGatt gatt,
                                         BluetoothGattCharacteristic characteristic,
                                         int status)
        {
            if (status == BluetoothGatt.GATT_SUCCESS)
            {
            }
        }

        private String checkCRC(String inStr)
        {
            try{
                byte[] buf =inStr.getBytes("GBK");
                byte bCheck = 0;
                for (int i = 0; i < buf.length; i++)
                {
                    bCheck = (byte)((int)bCheck ^ (int)buf[i]);
                }
                return String.format("%02X", bCheck);
            }
            catch(Exception e){return "00";}
        }

        @Override
        public void onCharacteristicChanged(BluetoothGatt gatt,
                                            BluetoothGattCharacteristic characteristic)
        {
            if ( characteristic.getUuid().toString().equals(
                    notifycha.getUuid().toString() ) )
            {
                final byte[] data = characteristic.getValue();
                if (data != null && data.length > 0)
                {
                    String reqCMD = new String(data);
                    if (reqCMD.indexOf("*") > 0)
                    {
                        if (reqCMD.indexOf("@03") >= 0 )
                        {
                            Log.i(TAG, "回复退出."+reqCMD);
                            disconnect();
                            close();
                        } else if ( reqCMD.indexOf("@ER") >= 0 )
                        {
                            Log.i(TAG, "回复错误."+reqCMD);
                            disconnect();
                            close();
                        }else if (reqCMD.indexOf("@04") >= 0)
                        {
                            String TID = ekey.open_key.substring(3, 11);
                            String KEY = reqCMD.substring(5, 9);
                            int sKey = Integer.parseInt(KEY, 16);
                            int sNum = sKey % 16;
                            sKey = ((sKey << sNum) | (sKey >> (16 - sNum)));
                            byte[] KEYS = new byte[2];
                            KEYS[0] = (byte) (sKey / 256);
                            KEYS[1] = (byte) (sKey % 256);
                            byte[] TIDS = new byte[4];
                            TIDS[0] = (byte) Integer.parseInt(TID.substring(0, 2), 16);
                            TIDS[1] = (byte) Integer.parseInt(TID.substring(2, 4), 16);
                            TIDS[2] = (byte) Integer.parseInt(TID.substring(4, 6), 16);
                            TIDS[3] = (byte) Integer.parseInt(TID.substring(6, 8), 16);
                            for (int i = 0; i < 4; i++)
                            {
                                TIDS[i] = (byte) (TIDS[i] ^ KEYS[i % 2]);
                            }
                            String mCmd = ekey.open_key.replace(TID, String.format("%02X", TIDS[0]) + String.format("%02X", TIDS[1]) + String.format("%02X", TIDS[2]) + String.format("%02X", TIDS[3]));
                            mCmd = mCmd.substring(0, mCmd.length() - 3) + checkCRC(mCmd.substring(1, mCmd.length() - 3)) + "*";

                            characteristic.setValue(0,
                                    BluetoothGattCharacteristic.FORMAT_UINT8, 0);
                            characteristic.setValue(mCmd);
                            writeCharacteristic(characteristic);
                        }
                    }
                }
            }
        }

        public void writeCharacteristic(BluetoothGattCharacteristic characteristic) {
            if ( mBluetoothGatt == null) {
                Log.w(TAG, "BluetoothAdapter not initialized");
                return;
            }
            mBluetoothGatt.writeCharacteristic(characteristic);
        }
    };

    public class LocalBinder extends Binder {
        JBMBLEEGuard getService() {
            return JBMBLEEGuard.this;
        }
    }

    @Override
    public IBinder onBind(Intent intent) {
        return mBinder;
    }

    @Override
    public boolean onUnbind(Intent intent) {
        // After using a given device, you should make sure that BluetoothGatt.close() is called
        // such that resources are cleaned up properly.  In this particular example, close() is
        // invoked when the UI is disconnected from the Service.
        close();
        return super.onUnbind(intent);
    }

    private final IBinder mBinder = new LocalBinder();

    /**
     * Initializes a reference to the local Bluetooth adapter.
     *
     * @return Return true if the initialization is successful.
     */
    public boolean initialize() {
        // For API level 18 and above, get a reference to BluetoothAdapter through
        // BluetoothManager.

        if (mBluetoothManager == null) {
            mBluetoothManager = (BluetoothManager) getSystemService(Context.BLUETOOTH_SERVICE);
            if (mBluetoothManager == null) {
                Log.e(TAG, "Unable to initialize BluetoothManager.");
                return false;
            }
        }

        mBluetoothAdapter = mBluetoothManager.getAdapter();
        if (mBluetoothAdapter == null) {
            Log.e(TAG, "Unable to obtain a BluetoothAdapter.");
            return false;
        }

        return true;
    }

    /**
     * Connects to the GATT server hosted on the Bluetooth LE device.
     *
     * @param address The device address of the destination device.
     *
     * @return Return true if the connection is initiated successfully. The connection result
     *         is reported asynchronously through the
     *         {@code BluetoothGattCallback#onConnectionStateChange(android.bluetooth.BluetoothGatt, int, int)}
     *         callback.
     */
    public boolean connect(IEGuardKey ekey, DoorEvent doorevent, String sname ) {

        this.ekey = ekey;

        if (mBluetoothAdapter == null || ekey == null) {
            Log.w(TAG, "BluetoothAdapter not initialized or unspecified address.");
            return false;
        }

        // Previously connected device.  Try to reconnect.
        if (mBluetoothDeviceAddress != null && ekey.mac.equals(mBluetoothDeviceAddress)
                && mBluetoothGatt != null) {
            Log.d(TAG, "Trying to use an existing mBluetoothGatt for connection.");
            if (mBluetoothGatt.connect()) {
                mConnectionState = STATE_CONNECTING;
                return true;
            } else {
                return false;
            }
        }

        final BluetoothDevice device = mBluetoothAdapter.getRemoteDevice(ekey.mac);
        if (device == null) {
            Log.w(TAG, "Device not found.  Unable to connect.");
            return false;
        }

        BTKeyGattCallback callback = new BTKeyGattCallback();
        callback.Init(ekey,null,"NO1");
        callback.mBluetoothGatt = device.connectGatt(this, false, callback);
        callback.Born(3,1000);
        // We want to directly connect to the device, so we are setting the autoConnect
        // parameter to false.
//        mBluetoothGatt = device.connectGatt(this, false, mGattCallback);
        Log.d(TAG, "Trying to create a new connection.");
        mBluetoothDeviceAddress = ekey.mac;
        mConnectionState = STATE_CONNECTING;
        return true;
    }

    /**
     * Disconnects an existing connection or cancel a pending connection. The disconnection result
     * is reported asynchronously through the
     * {@code BluetoothGattCallback#onConnectionStateChange(android.bluetooth.BluetoothGatt, int, int)}
     * callback.
     */
    public void disconnect() {
        if (mBluetoothAdapter == null || mBluetoothGatt == null) {
            Log.w(TAG, "BluetoothAdapter not initialized");
            return;
        }
        mBluetoothGatt.disconnect();
    }

    /**
     * After using a given BLE device, the app must call this method to ensure resources are
     * released properly.
     */
    public void close() {
        if (mBluetoothGatt == null) {
            return;
        }
        mBluetoothGatt.close();
        mBluetoothGatt = null;
    }

    /**
     * Request a read on a given {@code BluetoothGattCharacteristic}. The read result is reported
     * asynchronously through the {@code BluetoothGattCallback#onCharacteristicRead(android.bluetooth.BluetoothGatt, android.bluetooth.BluetoothGattCharacteristic, int)}
     * callback.
     *
     * @param characteristic The characteristic to read from.
     */
    public void readCharacteristic(BluetoothGattCharacteristic characteristic) {
        if (mBluetoothAdapter == null || mBluetoothGatt == null) {
            Log.w(TAG, "BluetoothAdapter not initialized");
            return;
        }
        mBluetoothGatt.readCharacteristic(characteristic);
    }

    /**
     * Enables or disables notification on a give characteristic.
     *
     * @param characteristic Characteristic to act on.
     * @param enabled If true, enable notification.  False otherwise.
     */
    public void setCharacteristicNotification(BluetoothGattCharacteristic characteristic,
                                              boolean enabled) {
        if (mBluetoothAdapter == null || mBluetoothGatt == null) {
            Log.w(TAG, "BluetoothAdapter not initialized");
            return;
        }
        mBluetoothGatt.setCharacteristicNotification(characteristic, enabled);

        // This is specific to Heart Rate Measurement.
        if (UUID_HEART_RATE_MEASUREMENT.equals(characteristic.getUuid())) {
            BluetoothGattDescriptor descriptor = characteristic.getDescriptor(
                    UUID.fromString(SampleGattAttributes.CLIENT_CHARACTERISTIC_CONFIG));
            descriptor.setValue(BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE);
            mBluetoothGatt.writeDescriptor(descriptor);
        }
    }

    /**
     * Retrieves a list of supported GATT services on the connected device. This should be
     * invoked only after {@code BluetoothGatt#discoverServices()} completes successfully.
     *
     * @return A {@code List} of supported services.
     */
    public List<BluetoothGattService> getSupportedGattServices() {
        if (mBluetoothGatt == null) return null;

        return mBluetoothGatt.getServices();
    }
}
